Jon L. Dunn and Jonathan Alderfer with maps by Paul Lehman

National Geographic Birds of North America, 6th Edition was released to the public
on November 1, 2011. The publisher says "The guide contains the most all-new material since
the first edition was published more than 25 years ago. It includes 300 new art figures;
unique subspecies maps never before seen in a field guide; extensive migration information
overlaid on species maps; field-mark labels on all artwork; text updates to include
new species; reorganization reflecting taxonomic changes in the bird community;
organization, readability, and increased page count with a fresh new design."

Jonathan described the filming and editing process as follows. A 35mm digital camera was set up on a tripod above his drawing table.
The camera had an intervalometer hooked up to it
that was set to take an image every 10 seconds when it was turned on. The sheet Jonathan was painting on had to be fixed to
the table for continuity in the images. He said this was a constraint that he had to learn to deal with since normally he would be
turning the sheet often even having it upside down. The filming took place over 4 to 5 days and was 12 hours of elapsed time.
There's an 8 minute version of the video which uses all the captured images. The 1 minute version above was edited down by
dropping 7 frames then using a frame, dropping 7 frames then using a frame, etc. Jonathan said that he forgot to turn on
the intervalometer once and he can see the quick jump in the art in the video playback. Can you?